Computational methods for monitoring structural damage in metal components
Hearndon, Jesse Loren
Many computational methodologies have been developed over the years with the goal of characterizing damage presence in structural components. In this thesis two approached were investigated. The first approach covered in this thesis is the modeling of damage presence through the reduction of the modulus of elasticity. This approach was mainly applied to a cantilevered beam of uniform cross-section. Various crack configurations/orientations were investigated, and from this data equations relating modulus as a function of crack length were derived. The second approach deals with modifying the local flexibility at the location of damage through modification of the element stiffness matrix. This approach has certain advantages in that it can adequately capture the global modal and displacement effects of damage without the added computational effort of mesh refinement that is required for physically modeled cracks.